Four people have killed in the northeast Nigerian city of Potiskum after two female suicide bombers blew themselves up in a crowded market.
The blasts at the Kasuwar Jagwal mobile phone market in the commercial capital of Yobe State came just a day after a young girl thought to be aged only 10 killed 19 in Maiduguri, in neighbouring Borno State.
Also on Saturday, two people were killed when a car exploded outside a police station in Potiskum.
A security source involved in the rescue operation on Sunday said one of the bombers looked 23 and the other 15.
"The first bomber - the 23 year-old - detonated her explosives just outside the entrance of the market, where volunteers were sweeping people going inside the market with metal detectors.
"The second bomber was terrified by the explosion and she tried to dash across the road but she also exploded."
Both the security official and a nurse at the Potiskum General Hospital said six people were confirmed dead and 21 were injured.
Witness Ibrahim Dambam said the second blast went off as people fled the first.
Sunday is Potiskum's market day and attracts traders and shoppers from all over Yobe State and beyond.
Panicked shoppers fled and traders abandoned their stalls at both the mobile phone market and the city's main market, which is just next door.
There was no immediate claim of responsibility for the latest attacks but suspicion is likely to fall on Boko Haram, which have increasingly used female suicide bombers since last June.
